Tech Interview Questions

Practice the exact questions companies are asking right now.

Questions

12.2k

Companies

569

Updated

10.14.2026

12.2k Questions 569 Companies10.14.2026

PLTCHK

"I got asked a hardcore MCM DP question and I saw it on PracHub as well. Solved that question in 5 minutes. Without PracHub I doubt I could solve it in 5 hours. Though somehow didn't get hired, perhaps I guess I solved it too fast? /s"

_The_TaNk_

"Believe me i'm a student here jn US. Recently interviewed for MSFT. They asked me exact question from PracHub. I saw it the night before and ignored it cause why waste time on random sites. I legit wanna go back and redo this whole thing if I had chance. Not saying will work for everyone but there is certainly some merit to that website. And i'm gonna use it in future prep from now on like lc tagged"

ChrisSenior SWE, LinkedIn

"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."

sleepy33

"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."

JakeSenior ML Engineer, Lyft

"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."

nuggetlord

"I've used LC, Glassdoor, and random Discords. Nothing comes close to the accuracy here. The questions are actually current — that's what got me. Felt like I had a cheat sheet during the interview."

CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes

"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."

AndySWE-II, Google

"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."

couchpotato99

"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."

ShrutiData Engineer, Salesforce

"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."

midnightramen

"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."

BiancaFrontend Eng, Figma

"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."

tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa

"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."

PLTCHK

_The_TaNk_

ChrisSenior SWE, LinkedIn

"10 years of experience but never worked at a top company. PracHub's senior-level questions helped me break into FAANG at 35. Age is just a number."

sleepy33

"I was skeptical about the 'real questions' claim, so I put it to the test. I searched for the exact question I got grilled on at my last Meta onsite... and it was right there. Word for word."

JakeSenior ML Engineer, Lyft

"Got a Google recruiter call on Monday, interview on Friday. Crammed PracHub for 4 days. Passed every round. This platform is a miracle worker."

nuggetlord

CarlosFull Stack, Shopify

"The solution quality is insane. It covers approach, edge cases, time complexity, follow-ups. Nothing else comes close."

boba.tea.vibes

"Legit the only resource you need. TC went from 180k -> 350k. Just memorize the top 50 for your target company and you're golden."

AndySWE-II, Google

"PracHub Premium for one month cost me the price of two coffees a week. It landed me a $280K+ starting offer."

couchpotato99

"Literally just signed a $600k offer. I only had 2 weeks to prep, so I focused entirely on the company-tagged lists here. If you're targeting L5+, don't overthink it."

ShrutiData Engineer, Salesforce

"Coaches and bootcamp prep courses cost around $200-300 but PracHub Premium is actually less than a Netflix subscription. And it landed me a $178K offer."

midnightramen

"I honestly don't know how you guys gather so many real interview questions. It's almost scary. I walked into my Amazon loop and recognized 3 out of 4 problems from your database."

BiancaFrontend Eng, Figma

"Discovered PracHub 10 days before my interview. By day 5, I stopped being nervous. By interview day, I was actually excited to show what I knew."

tambrahm007

"I recently cleared Uber interviews (strong hire in the design round) and all the questions were present in prachub."

toa

"The search is what sold me. I typed in a really niche DP problem I got asked last year and it actually came up, full breakdown and everything. These guys are clearly updating it constantly."

Showing 20 results

xAI

Medium

Software Engineer

Token Bucket Rate Limiter with Lazy Refill Backed by a Cache

Token Bucket Rate Limiter with Lazy Refill Backed by a Cache You are building the enforcement layer of a rate limiter. Every user has a token bucket s...

Software Engineer Locked

Trace Java Static and Instance Field Initialization

Consider a Java class with static fields a and c, an instance field b, and this initialization: c = 2; the constructor executes a++, b++, and c++. Mak...

Software Engineering Fundamentals

Refactor code and enforce robustness

Code Review and Refactor: Summing a CSV Column Context You are reviewing a short Python script that sums a numeric column from a CSV using pandas. You...

Coding & AlgorithmsCode Quality & MaintainabilityPandas & Python Data

Data ScientistSenior+

When do you use mixed-effects models

You are modeling a user outcome (e.g., watch time or retention) across many countries and many users. Observations are nested (multiple days per user;...

Machine LearningRegression & Statistical Modeling

Solve palindrome and missing-number variants

You are asked to solve two coding problems and analyze the time and space complexity of each. 1. Palindrome check Given a string s, determine wheth...

Software Engineer Locked

Build a Concurrent Recurring Job Scheduler

Design a thread-safe recurring job scheduler with concurrent schedule and deschedule operations. Specify timing semantics, cancellation races, stale e...

Software Engineering Fundamentals

Software Engineer Locked

Work Productively with Someone Who Disagrees

Describe a meaningful disagreement with someone you still needed to work with closely. Show how you understood their concerns, adjusted your own appro...

Behavioral & Leadership

30 people solved

Jun 3, 2026

Design batch and streaming ETL architecture

Design batch and streaming ETL architecture System Design: End-to-End Data Platform for Product Analytics (Batch + Near-Real-Time) Context Design a sc...

System DesignETL & Data PipelinesBatch & Stream Processing

Software Engineer Locked

Reverse a Singly Linked List

Reverse a finite singly linked list represented by nested two-item Python lists. Reuse the existing node objects without allocating replacements, and ...

Design a high-throughput distributed rate limiter

Question Design a high-throughput, distributed rate-limiting service that runs across multiple regions with low latency and burst tolerance. The servi...

System DesignRate LimitingPartitioning & Consistent Hashing

Design a Multi-Agent Chat Backend

Design the backend for an LLM-powered chat product used by customers in a financial-technology setting. The interviewer will show a simple demo of a c...

Explain ROC-AUC vs PR-AUC tradeoffs

Question You trained a binary classifier that outputs predicted probabilities. Compare ROC-AUC and PR-AUC (the latter usually reported as Average Prec...

Machine LearningModel Evaluation

Design an object-oriented parking lot system

Design an object-oriented model for a parking lot management system. Requirements: - The parking lot has multiple levels; each level has multiple park...

Software Engineering FundamentalsLow-Level Design (OOP)

232 people solved

Nov 2, 2025

Find kth largest element in array

Question Given an unsorted array of integers nums and an integer k, return the k-th largest element in the array. The 1st largest element is the maxim...

Machine Learning Engineer

Implement permutations and image retrieval

The coding portion included several short exercises for a vision-focused ML role: 1. Given an array of distinct integers, return all possible permutat...

Coding & AlgorithmsEmbeddings & Vector SearchBacktracking & Recursion

Minimize image processing cost with discount

Question You have n images. For the i-th image, processing costs filterCost[i] per day and must run from startDay[i] to endDay[i] inclusive. Each day ...

Coding & AlgorithmsIntervals & SchedulingGreedy

Diagnose and Validate a Regression Model

You fit a regression model to predict a continuous outcome. The headline error metric looks acceptable, but the team asks whether the model is trustwo...

Data Scientist Locked

Explain an End-to-End ML Project to Mixed Audiences

Prepare an end-to-end ML project deep dive that covers problem framing, leakage-safe validation, a real challenge, deployment or handoff, impact, limi...

Behavioral & Leadership

Machine Learning Engineer Locked

Design Duplicate File Detection

This question evaluates system design and storage engineering skills, including scalable file-processing, efficient I/O and resource management, corre...

System DesignFile & Media StorageSystem Design Fundamentals

Count same-color squares in a character grid

You are given a 2D grid (matrix) of characters. Each character represents a color: cells with the same character are considered the same color. Formal...

Coding & AlgorithmsDynamic ProgrammingGrids & Matrices

243 people solved

Nov 22, 2025

Tech Interview Questions

Token Bucket Rate Limiter with Lazy Refill Backed by a Cache

Trace Java Static and Instance Field Initialization

Refactor code and enforce robustness

When do you use mixed-effects models

Solve palindrome and missing-number variants

Build a Concurrent Recurring Job Scheduler

Work Productively with Someone Who Disagrees

Design batch and streaming ETL architecture

Reverse a Singly Linked List

Design a high-throughput distributed rate limiter

Design a Multi-Agent Chat Backend

Explain ROC-AUC vs PR-AUC tradeoffs

Design an object-oriented parking lot system

Find kth largest element in array

Implement permutations and image retrieval

Minimize image processing cost with discount

Diagnose and Validate a Regression Model

Explain an End-to-End ML Project to Mixed Audiences

Design Duplicate File Detection

Count same-color squares in a character grid

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